托福TPO是我们托福阅读的重要参考资料，为了方便大家备考，下面小编给大家整理了托福TPO4阅读文本及题目答案Part3，希望大家喜欢。
托福TPO4阅读真题原文Part3
Petroleum Resources
Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment. Microscopic organisms settle to the seafloor and accumulate in marine mud. The organic matter may partially decompose, using up the dissolved oxygen in the sediment. As soon as the oxygen is gone, decay stops and the remaining organic matter is preserved.
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